From the Guardian - more proof that wine tasting is bunk:
To summarize - small winery owner with a background in science began running a series of wine tasting experiments with the California Wine competition. The same wine presented in a flight would be scored very differently by most judges within minutes. It also summarises a few of the same studies that Denny talks about in the book. Even judges who were consistent varied from year to year. (e.g. a super consistent judge one year might be super variable in follow up years)
But.. before you get to feeling all high and mighty - don't think that beer judges don't fall prey to the same type of follibles. The problem lays with the susceptibility of human perception. Beer is extraordinarily complex with plenty of pitfalls for our palates to trip up on!